The granddaddy of genealogy wikis is WeRelate, sponsored by the Foundation for On-Line Genealogy in partnership with the Allen County (Ind.) Public Library. With pages on more than 2 million people and families, WeRelate is the largest genealogy wiki—and it’s geared primarily toward sharing family tree data. The goal is to encourage people to post their research on specific ancestors for others to find and add to, so everyone benefits from the collaboration.
Instead of ancestral data, the Church of Jesus Christ of Latter-day Saints’ genealogy wiki focuses on the family history craft itself, serving as a platform to share research advice—not to post what you know about specific ancestors.
From the March 2009 Family Tree Magazine